| http://www.w3.org/ns/prov#value | - However, the power source may be a container of a combustible fuel such as butane or propane, for example, in which case the contacts would be a means of connecting the power source to the means of delivering the combustible fuel to the heating element. [0093] The heating element is positioned in a manner such that air flowing through the air flow path contacts the heating element and is warmed.
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